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News about Mauna Loa.

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Which U.S. volcanoes pose a threat?

Which U.S. volcanoes pose a threat?

USGS Volcanic Threat Assessment updates the 2005 rankings.

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Volcanic threat assessment helps prioritize risk reduction efforts at U.S. volcanoes

Volcanic threat assessment helps prioritize risk reduction efforts at U.S. volcanoes

The U.S. Geological Survey assesses active and potentially active volcanoes in the U.S., focusing on history, hazards and the exposure of people...

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Volcano Watch — Explosive eruptions at the summit of Mauna Loa: When did they occur?

Volcano Watch — Explosive eruptions at the summit of Mauna Loa: When did they occur?

Three deposits from explosive eruptions at the summit of Mauna Loa are located west, northwest, and east of Moku‘āweoweo, the volcano's summit caldera...

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Volcano Watch — Disaster strikes Ka‘ū in 1868: The rest of the story

Volcano Watch — Disaster strikes Ka‘ū in 1868: The rest of the story

Already reeling from a destructive earthquake and deadly tsunami and mud flow on April 2, 1868, Ka‘ū residents on the Island of Hawai‘i hoped for a...

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Report provides volcanological context for 19th century artwork.

Report provides volcanological context for 19th century artwork.

In this new USGS Open-File Report, artwork is matched with the approximate date and volcanological context of the scene, showing eruptions at Kīlauea...

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Photo and Video Chronology - Mauna Loa - March 16, 2018

Photo and Video Chronology - Mauna Loa - March 16, 2018

On March 14, HVO's webcam [MLcam] captured this image of a double rainbow.

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Volcano Watch — Happy birthday Pu‘u ‘Ō‘ō! A look back at what happened in 2017

Volcano Watch — Happy birthday Pu‘u ‘Ō‘ō! A look back at what happened in 2017

On January 3, 2018, Pu‘u ‘Ō‘ō on Kīlauea Volcano's East Rift Zone reaches its 35th birthday. 

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Volcano Watch — Evolving tube network blocked and diverted lava from the Kamokuna delta

Volcano Watch — Evolving tube network blocked and diverted lava from the Kamokuna delta

Lava erupting from the active vent on the east flank of Pu‘u ‘Ō‘ō has not entered the ocean or reached the Kamokuna lava delta during the past month...

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Volcano Watch — Progress can be slow but adds up

Volcano Watch — Progress can be slow but adds up

Where do we stand today with big-picture knowledge of Kīlauea and Mauna Loa acquired in the past few decades?

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Volcano Watch — January is Volcano Awareness Month on the Island of Hawai‘i

Volcano Watch — January is Volcano Awareness Month on the Island of Hawai‘i

January 2018 is Hawai‘i Island's 9th annual Volcano Awareness Month. 

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Photo and Video Chronology - Mauna Loa - December 3, 2017

Photo and Video Chronology - Mauna Loa - December 3, 2017

A new HVO webcam provides improved views of Mauna Loa's summit caldera, Moku‘āweoweo, from the northwest rim. 

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Volcano Watch — Did aerial bombing stop the 1935 Mauna Loa lava flow?

Volcano Watch — Did aerial bombing stop the 1935 Mauna Loa lava flow?

A widely-held belief is that Thomas Jaggar, founder of the Hawaiian Volcano Observatory, was able to stop a Mauna Loa lava flow in 1935. But is it...

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